Edge-folded steel head combined shoe&#39;s insole

ABSTRACT

An edge-folded steel head combined shoe insole has a groove defined in a front end and two sides of the insole. The insole is also provided with an inner welt downwardly extended peripherally thereunder, and is thickened gradually from a rear end to a front end. The depth of the groove is shorter than the thickness of the inner welt so that a folded edge of the steel head can be inserted in the groove. This avoids conflict of a sewing needle to the folded edge of the steel head when sewing the vamp onto the inner welt of the insole, thereby the steel head is well supported to have shoe&#39;s strength heightened.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates generally to an insole structure of safety working shoes combined with an edge-folded steel head. Particularly, the present invention relates to an insole structure of Goodyear welted shoes.

[0003] 2. The Prior Arts

[0004] Generally speaking, the structure of leather shoes is largely comprised of a sole and a vamp, in which the sole further comprises, from bottom to top, an outsole, a thin sole, an insole, and a welt surrounding the upper surface of the outsole peripherally. The insole is a connecting interface between the outsole and the vamp for building the shoe's skeleton.

[0005] In the Goodyear welted shoes, a downwardly extended inner welt is arranged peripherally in a lower surface of the insole to completely adhere the sole and the vamp by taking advantage of seaming together vamp's steel string and stitching string without detachment forever.

[0006] In fabricating the conventional Goodyear shoes as shown in FIG. 1, the procedure is to first nail an insole (A) of a downwardly extended inner welt (A1) on the bottom face of a last (7) (wooden mold); then, put a steel head (2) in shape corresponding to toes on the last (7); use a lasting machine for stretching a vamp (6) to cover the steel head (2); penetrate the vamp (6) and the inner welt (A1) with steel string to form a first joint; seam the vamp (6) and the inner welt (A1) with stitch string to form a second joint (shown in FIG. 2) so as to enhance the combination of the insole (A) and the vamp (6); then in sequence adhere a thin sole (3) to a glued bottom face of the insole (A) in the scope of the inner welt (A1), adhere an outsole (4) on the bottom face of the thin sole (3), and seam an outer welt (5) peripherally on the outsole (4) for embellishment (shown in FIG. 3).

[0007] In order to avoid conflicts of sewing needles when sewing the vamp (6) and the inner welt (A1), the lower edge of the conventional steel head (2) is practically vertical without a folded edge (shown in FIG. 2). However, such a design is defective in that the lower end of the steel head (2) is not sufficiently supported. Hence, the impact and pressure resistivity thereof depends on the strength of the bottom material.

[0008] In the case a steel head having a wide enough lower folded edge is adoped, the sewing needle would be liable to conflict the edge folded when sewing. For improvement, a conventional measure shown in FIG. 4 is to lay a folded edge 21 between an upper insole (C) and a lower insole (B), in which the upper insole (C) is a plain mat while the lower insole B, just as the same with the insole (A), is provided with a downwardly extended inner welt (A1). In fabricating the shoes, the procedure is to last the vamp (6), then prop and seam to fix the vamp (6) and an inner welt (B1) with steel string and stitch string respectively (shown in FIG. 5); then in sequence adhere a thin sole (3) to a glued bottom face of the lower insole (B) in the scope of the inner welt (B1), adhere an outsole (4) on the bottom face of the thin sole (3), seam an outer welt (5) peripherally on the outsole (4) for embellishment (shown in FIG. 6).

[0009] Nevertheless, as two different lasting machines are required for two respective insoles, the process becomes complicated, the cost gets higher, and the shoes become heavier and uncomfortable.

SUMMARY OF THE INVENTION

[0010] A primary object of the present invention is to solve a first technical problem regarding the insufficient impact- and pressure-resistivity of the conventional Goodyear shoes of single-layer insole, in which the steel head is lack of a folded edge.

[0011] Another object of the present invention is to solve a second technical problem regarding the complicated fabricating process, high cost, and heavy weight of the conventional Goodyar shoes of double-layer insole, in which the steel head has a folded edge.

[0012] In compared with the prior arts, a single-layer insole and an edge-folded steel head is adopted in the present invention, in which the folded edge is embedded in a groove defined in the insole such that sewing needle is prevented from hitting the folded edge when sewing an inner welt, and meanwhile, the steel head is enough supported to strengthen its impact- and pressure-resistivity.

[0013] For more detailed information regarding advantages or features of the present invention, at least an example of preferred embodiment will be described below with reference to the annexed drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The related drawings in connection with the detailed description of the present invention to be made later are described briefly as follows, in which:

[0015]FIG. 1 shows a conventional single-layer insole;

[0016]FIG. 2 shows an assembled structure of the conventional single-layer insole and a steel head without folded edge;

[0017]FIG. 3 shows that the assembled insole and steel head in FIG. 2 is further combined with a vamp, thin sole, outsole, and outer welt;

[0018]FIG. 4 shows the assembly structure of a conventional double-layer insole and a steel head having folded edge;

[0019]FIG. 5 shows that the assembled insole and steel head in FIG. 4 is further combined with a vamp, thin sole, outsole, and outer welt;

[0020]FIG. 6 shows that the conventional assembly structure in FIG. 5 is further combined with an outer welt;

[0021]FIG. 7 shows an insole constructed in accordance wit the present invention;

[0022]FIG. 8 shows the assembly structure of an insole, edge-folded steel head, and vamp of the present invention; and

[0023]FIG. 9 shows that the assembly structure in FIG. 8 is further combined with a thin sole, outsole, and an outer welt.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0024]FIG. 7 shows an insole (1) constructed in accordance with the present invention. A downwardly extended inner welt (11) is arranged peripherally beneath the insole (1), and a groove (12) is defined in the front edge and two sides of the insole (1). The groove (12) has a dimension selected to match a folded edge (21) of a steel head (2) with the thickness of the inner welt (11) larger than the depth of the groove (12); and the insole (1) being gradually thickened from a rear end to a front end such that the front end is thick enough for forming the groove (12). In the embodiment illustrated, the insole (1) is integrally formed.

[0025] As shown in FIG. 8, when combining the insole (1) and the steel head (2) for making shoes, the procedure is to first nail the insole (1) onto the bottom face of a last (7); then in sequence put the steel head (2) having a preformed folded edge (21) at its lower end on the last (7) and insert the folded edge (21) in the groove of the insole (1); pull the vamp (6) to cover the steel head (2) with a lasting machine and punch steel string into the vamp (6) and the inner welt (11) to perform a first fastening process of the vamp (6) and the inner welt (11); sew the vamp (6) and the inner welt (11) with stitch string by a sewing machine to perform a second fastening process of the vamp (6) and the inner welt (11) to ensure the combination of the insole (1) and the vamp (6) without worry of detachment.

[0026] In the above process, because the folded edge (21) is embedded in the groove (12) and is higher than the root portion of the inner welt (11), the sewing needle would not strike the folded edge (21) when sewing in order to avoid breaking of the needle. Finally, the procedure is in sequence to glue the bottom face of the insole (1); adhere a thin sole (3) on that bottom face in the scope of the inner welt (11); adhere a outsole (4) on the bottom face of the thin sole (3); and sew an outer welt (5) peripherally in the upper face of the outsole (4) for embellishment (shown in FIG. 9).

[0027] It is emphasized here that since the folded edge (21) of the steel head (2) is embedded in the groove (12), the lower edge of the steel head (2) is securely supported to obtain high impact- and pressure-resistivity. Moreover, simplifying the making process of shoes, saving labors, and lessening shoe weight without deteriorating comfortableness, are possible.

[0028] In the above described, at least one preferred embodiment has been described in detail with reference to the drawings annexed, and it is apparent that numerous changes or modifications may be made without departing from the true spirit and scope thereof, as set forth in the claims below. 

What is claimed is:
 1. An edge-folded steel head combined shoe insole, comprising a downwardly extended inner welt arranged peripherally in a bottom face of the insole; the insole being gradually thickened from a rear end to a front end; a groove defined in a front edge and two sides of the insole and having a depth shorter than the thickness of the inner welt.
 2. The insole according to claim 1, wherein the insole is formed integrally by injection techniques. 